diff --git a/src/ecdsa.js b/src/ecdsa.js
index 1bfd5d6..f5775c2 100644
--- a/src/ecdsa.js
+++ b/src/ecdsa.js
@@ -23,7 +23,7 @@ ECPointFp.prototype.getEncoded = function (compressed) {
   var enc = integerToBytes(x, 32);
 
   if (compressed) {
-    if (y.testBit(0)) {
+    if (y.isEven()) {
       enc.unshift(0x02);
     } else {
       enc.unshift(0x03);